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부품번호 QT511-ISSG 기능
기능 QWHEEL TOUCH SLIDER IC
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QT511-ISSG 데이터시트, 핀배열, 회로
www.DataSheet4U.com
LQ
QT511-ISSG
QWHEEL™ TOUCH SLIDER IC
z Rotary finger-touch ‘wheel’ slider control
z Center-button compatible signal processing
z Extremely simple circuit - no external active components
z SPI slave-mode interface
z Self-calibration and drift compensation
z Spread-spectrum operation for optimal EMC compliance
z 2.5 - 5.5V single supply operation; very low power
z Enhanced power supply & thermal drift rejection
z 14-pin TSSOP Pb-free package
z Compatible with clear ITO over LCD construction
z Inexpensive, simple 1-sided PCB construction possible
z Reference design board available
VDD
SDO
/SS
SCLK
SNS3B
SNS3A
SNS2B
1 14
2 13
3 QT511 12
4 11
5 10
69
78
GND
DRDY
DETECT
SDI
SNS1A
SNS1B
SNS2A
APPLICATIONS
y Personal electronics
y Appliance controls
y Shaft encoders
y Automotive controls
The QT511 QSlide™ IC is a new type of rotary capacitive touch ‘slider’ sensor IC based on Quantum’s patented
charge-transfer methods. This unique IC allows designers to create speed or volume controls, menu bars, and other more
exotic forms of human interface on the panel of an appliance. Generally it can be used to replace any form of rotary knob,
through a completely sealed panel.
The device uses a simple, inexpensive resistive sensing element between three connection points. The sense element can be
circular or any polygon shape.
The QT511 can report a single rapid touch anywhere along the sense element, or, it can track a finger moving along the wheel
surface in real time. The device self-calibrates under command from a host controller.
This device uses three channels of simultaneous sensing across a resistive element to determine finger position, using
mathematical analysis. A positional accuracy of 5% (or better) is relatively easy to achieve. The acquisitions are performed in a
burst mode which uses proprietary spread-spectrum modulation for superior noise immunity and low emissions.
The output of the QT511 can also be used to create discrete controls in a circle, by interpreting sets of number ranges as
buttons. For example, the number range 0..19 can be button A, 30..49 button B, 60..79 button C etc. Continuous wheel action
and discrete controls can be mixed on a single element, or, the element can be reinterpreted differently at different times, for
example when used below or on top of an LCD to act as a menu input device that dynamically changes function in context. The
device is compatible with ITO (Indium Tin Oxide) overlays on top of various displays or simply to provide for a backlighting
effect.
The QT511 has two enhancements over the QT510. It is significantly more stable with temperature and other environmental
influences, and it recognizes a touch in the middle of the wheel as being invalid, which aids considerably in placing a touch
button in the center of the wheel. However, unlike the QT510 the QT511 does not have a proximity detection function.
LQ
DataSheet4 U .com
Copyright © 2005 QRG Ltd
QT511-ISSG R6.01/1005




QT511-ISSG pdf, 반도체, 판매, 대치품
www.DataSheet4U.com
Figure 1-3 E510 PCB Layout (Applies also to QT511)
electrode area during power-on or
recalibration, and then removed. In this
sequence of events, the finger is ‘calibrated
away’ and is not recognized as a touch.
When the finger is removed, the signals
from the wheel are inverted and a position is
reported as though the wheel has been
touched. However, this position report is in
error.
After any calibration event (i.e. a power-on
cycle or a CAL command) the next
detection event should be checked to see if
it is in error by using the special error
command. If it an error is reported, the
device should be immediately calibrated
again so that the wheel becomes properly
functional (Section 3.3.2).
Note: During calibration, the device cannot communicate.
DRDY will remain low during this interval.
1.7 Sensitivity Setting
The sensitivity of the slider area to finger detection is
dependent on the values of the three Cs capacitors (Section
2.2) and the threshold setting (Section 3.3.5). Larger values
of Cs increase sensitivity and also reduce granularity (missing
codes), at the expense of higher power consumption due to
longer acquisition bursts.
The threshold setting can be used to fine tune the sensitivity
of the sensing element. When setting the threshold, use the
smallest finger size for which detection is desired (normally a
6mm diameter spot), and probe at one of the two center
connection points where sensitivity is lowest. The stretches
between connection points are generally slightly higher in
sensitivity due to the collection of charge from two channels.
A ‘standard finger’ probe can be made by taking a piece of
metal foil of the required diameter, gluing it on the end of a
cylinder of sponge rubber, and connecting it to ground with a
wire. This probe is pressed against the panel centered on one
of the middle two connection points; the threshold parameter
is iterated until the sensor just detects. It is important to push
the probe into the panel quickly and not let it linger near the
electrode afterwards, so that the drift compensation
mechanism does not artificially create a threshold offset
during the iteration process. Between threshold changes, the
probe must be removed to at least 100mm from the panel.
2 Wiring & Parts
The device should be wired according to
Figure 1-1. An example PCB layout is
shown in Figure 1-3.
2.1 Electrode Construction
The wheel electrode should be a resistive element of
between 200K to 500K ohms (400K nominal target value)
between each set of connection points, of a suitable diameter
and width. Under heavy capacitive loading (for example if the
element must be placed immediately over a ground plane
within a millimeter), the resistance might need to be lowered.
Observe the sensing pulses for flatness on their tops in the
middle of a segment using a small coin and scope probe to
make sure the pulses fully settle before the falling edge (see
app note AN-KD02 Figure 7).
There are no known diameter restrictions other than those
governed by human factors.
The electrode can be made of a series chain of discrete
resistors with copper pads on a PCB, or from ITO (Indium Tin
Oxide, a clear conductor used in LCD panels and touch
screens) over a display. Thick-film carbon paste can also be
used, however linearity might be a problem as these films are
notoriously difficult to control without laser trimming or
scribing.
The linearity of the wheel is governed largely by the linearity
and consistency of the resistive element. Positional accuracy
to within 5% is routinely achievable with good grade resistors
and a uniform construction method.
1.8 Drift Compensation
The device features an ability to compensate for slow drift
due to environmental factors such as temperature changes or
humidity. Drift compensation is performed under host control
via a special drift command. See Section 3.3.3 for further
details.
1.9 Error Status
An error flag status is provided via a special command. An
error can only occur when a finger was touching the wheel
Table 1-2 Recommended Cs vs. Materials
Thickness,
mm
0.4
0.8
1.5
2.5
3.0
4.0
Acrylic
(εR =2.8)
10nF
22nF
47nF
100nF
-
-
Borosilicate glass
(εR =4.8)
5.6nF
10nF
22nF
39nF
47nF
100nF
lQ
4 QT511-ISSG R6.01/1005
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Note: Pin /SS clamps to Vss for 250ns after coming out of
sleep state as a diagnostic pulse. To prevent a possible pin
drive conflict, /SS should either be driven by the host as an
open-drain pull-high drive (e.g. with a 100K pullup resistor), or
there should be a ~1K resistor placed in series with the /SS
pin.
3.2.2 DRDY Line
The DRDY line acts primarily as a way to inhibit the host from
clocking to the QT511 when the QT511 is busy. It also acts to
signal to the host when fresh data is available after a burst.
The host should not attempt to clock data to the QT511 when
DRDY is low, or the data will be ignored or cause a framing
error.
On power-up, DRDY will first float for about 20ms, then pull
low for ~525ms until the initial calibration cycle has
completed, then drive high to indicate completion of
calibration. The device will be ready to communicate in
typically under 600ms (with Cs1 = Cs2 = Cs3 =100nF).
While DRDY is a push-pull output ; however, this pin floats
after power-up and after wake from Sleep mode, for ~400µs
(typical at Vdd = 3.3V). It is desirable to use a pulldown
resistor on DRDY to prevent false signalling back to the host
controller; see Figure 1-1 and Section 1.3.
3.2.3 MISO / MOSI Data Lines
MISO and MOSI shift on the falling edge of each CLK pulse.
The data should be clocked in on the rising edge of CLK. This
applies to both the host and the QT511. The data path follows
a circular buffer, with data being mutually transferred from
host to QT, and QT to host, at the same time. However the
return data from the QT is always the standard response byte
regardless of the command.
The setup and hold times should be observed per Figure 3-1.
3.2.4 Sleep Mode
Please refer to Figure 3-1, page 6.
The device always enters low-power sleep mode after an SPI
transmission (Figure 3-1), at or before about 35µs after the
last rising edge of CLK. Before entering sleep mode, the
device will lower DRDY. If another immediate acquisition
burst is desired, /SS should be pulsed at least 35µs after the
last rising edge of CLK. To prolong the sleep state, it is only
necessary to pulse /SS after an even longer duration. During
this time, the QT511 will wake up approximately every 3
seconds and burst before going back to sleep. This allows
the QT511 to compensate for thermal changes.
Changes on CLK will also cause the device to wake, however
the device will not cause an acquire burst to occur if /SS has
also gone low and high again.
In sleep mode, the device consumes only a few microamps of
current. The average current can be controlled by the host, by
adjusting the percentage of time that the device spends in
sleep.
The delay between the wake signal and the following burst is
1ms max to allow power to stabilize. The DETECT and DRDY
lines will float for ~400µs (typical at Vdd = 3.3V) during wake
from Sleep mode; see Section 1.3 for details.
After each acquisition burst, DRDY will rise again to indicate
that the host can do another SPI transmission.
3.3 Commands
Commands are summarized in Table 3-1. Commands can be
overlapped, i.e. a new command can be used to shift out the
results from a prior command.
All commands cause a new acquisition burst to occur when
/SS is raised again after the command byte is fully clocked.
Standard Response: All SPI shifts return a ‘standard
response’ byte which depends on the touch detection state:
No touch detection:
Bit 7 = 0 (0= not touched)
Bit 6 = 1 to indicate QWheel type
= 0 to indicate Linear slider type
Bits 5, 4, 3, 2: unused (report 0)
Bits 1, 0 reserved (report 0 or 1)
Is touch detection: Bit 7 = 1 (1= is touched)
Bits 0..6: Contains calculated position
Note that touch detection calculated position is based on the
results of the prior burst, which is triggered by the prior /SS
rising edge (usually, from the prior command, or, from a
dummy /SS trigger).
Bit 6 indicates the type of device: ‘1’ means that the device is
a wheel (e.g. QT511), and ‘0’ means the device is a linear
type (e.g. QT401 or QT411).
There are 5 commands as follows.
3.3.1 0x00 - Null Command
76543210
00000000
The Null command will trigger a new acquisition (if /SS rises),
otherwise, it does nothing. The response to this command is
the Standard Response byte, returned on the next SPI shift.
This command is predominant once the device has been
calibrated and is running normally.
3.3.2 0x01 - Calibrate
76543210
00000001
This command takes ~325ms @ 3.3V to complete.
0x01 causes the device to do a basic recalibration. After the
command is given the device will execute 10 acquisition
bursts in a row in order to perform the recalibration, without
the need for /SS to trigger each of the bursts. The host should
wait for DRDY to rise again after the calibration has
completed before shifting commands again.
This command should be given if there is an error
reported via the 0x04 command.
On power-up the device calibrates itself automatically and so
a 0x01 command is not required on startup.
The response to this command is the Standard Response
byte, returned on the next SPI shift. During calibration,
device communications are suspended.
3.3.3 0x03 - Drift Compensate
76543210
00000011
0x03 causes the sensor to perform incremental drift
compensation. This command must be given periodically in
order to allow the sensor to compensate for drift. The more
lQ
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QT511-ISSG

QWHEEL TOUCH SLIDER IC

Quantum
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QT511-ISSG

QWHEEL TOUCH SLIDER IC

QUANTUM
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